Hybrid two-mode squeezing of microwave and optical fields using optically pumped graphene layers

Area of Science:

• Quantum Optics
• Condensed Matter Physics
• Quantum Information Science

Background:

• Squeezed quantum states exhibit reduced uncertainty below the Heisenberg limit, crucial for quantum technologies.
• Existing methods for generating squeezed states focus on either microwave or optical fields separately.
• Hybrid squeezed modes, combining microwave and optical fields, are vital for integrating quantum superconducting and photonic systems but remain underexplored.

Purpose of the Study:

• To propose and demonstrate a novel method for achieving hybrid two-mode squeezing of microwave and optical fields.
• To explore the potential of graphene-based structures for generating these hybrid quantum states.
• To enable new applications by bridging quantum superconducting circuits and photonics.

Main Methods:

• Utilizing a graphene layered structure driven by a quantum microwave voltage.
• Subjecting the structure to two optical fields with distinct frequencies.
• Modulating graphene conductivity via electrical means to couple optical and microwave fields.
• Tuning the microwave frequency by adjusting operational parameters.

Main Results:

• Successfully achieved significant hybrid two-mode squeezing involving one microwave and one optical field.
• Demonstrated the feasibility of using graphene's tunable conductivity for hybrid state generation.
• Showcased tunability of the microwave frequency within the hybrid squeezed state.

Conclusions:

• The proposed graphene-based approach is the first to realize hybrid two-mode squeezing of microwave and optical fields.
• This work opens new avenues for quantum information processing and metrology by integrating disparate quantum systems.
• The tunability of the system offers flexibility for diverse quantum applications.